This article is about the All-New SimpliSafe system. If you purchased a system in 2017 or earlier, you have the Original SimpliSafe. If you're not certain which system you have, you can tell the difference here.
The following video walks through installing Entry Sensors. If you are trying to add a new sensor to an existing system, please see this page.
If you are still unable to install your entry sensors after watching this video, contact our support team. We stock a small number of thinner magnets that will let you install your entry sensors on difficult doors and windows.